Our Dermatologists

Australian doctors with specialist medical training.

Our dermatologists are registered medical specialists who have completed a four year specialist training program and obtained a Fellowship of the Australasian College of Dermatology (FACD).

Dermatologists specialise in the diagnosis, treatment and prevention of skin diseases and skin cancers for patients of all ages, from babies and children to adolescents and adults. They are also experts in the diagnosis and management of disorders affecting hair, nails and the wet areas of the mouth and genitalia.

Dr. Rhonda Harvey

BSc (Med), MBBS (Hons)(UNSW), PhD, FACD

Principal Dermatologist + Mohs Micrographic Surgeon

Dr Harvey graduated with honours in medicine from the University of New South Wales in 1999. As part of her post graduate training, Dr Harvey completed the Basic Surgical Training Program with the Royal Australian College of Surgeons while completing her PhD (Head & Neck Squamous Cell Carcinomas) with the Cancer Research Program at the Garvan Institute of Medical Research. Before commencing Dermatology training, Dr Harvey consolidated her research by undertaking a Post Doctoral Research Fellowship at the Dermatology Research Laboratories at the University of Sydney.

Dr Harvey began clinical Dermatology training in 2006 at the Royal Prince Alfred Hospital, St Vincent’s Hospital, Liverpool Hospital and Westmead Hospital hospitals while also completing rotations at the Skin & Cancer Foundation Australia, Darlinghurst and Westmead facilities.

Dr Harvey received a Fellowship of the Australasian College of Dermatologists (FACD) in 2010 after completing 4 years of fellowship training and completed a Mohs Surgical Fellowship at the Skin & Cancer Foundation, Westmead in 2011.

Professional interests include Skin Cancer & Melanoma Management, Mohs Surgery, Non-surgical Skin Cancer Management (including Photodynamic Therapy), Moderate to Severe Acne, Dermatitis & Eczema, Facial Pigmentation, Cosmetic and Non-cosmetic Laser.

Dr. Clare Shui Lyn Koh

BSc (Med), MBBS (Hons)(USYD), FACD


Dr Clare Koh graduated with honors from the University of Sydney in 2005 with a Bachelor of Medicine and Bachelor of Surgery. Dr Koh began clinical Dermatology training in 2011 and received fellowship with the Australasian College of Dermatologists in 2015.

Dr Koh is interested in the diagnosis and management of all aspects of diseases of the skin including the diagnosis and management of skin cancer.

Dr. Gilberto Moreno Bonilla



Dr Gilberto Moreno Bonilla graduated from Rosario University (Colombia) in 2003 and achieved Australian Medical Council recognition in 2006 whilst conducting clinical Dermatology research through the University of New South Wales. He successfully completed Basic Physicians Training and examinations in 2011, and broadened his medical experience through the St Vincents Area Health Network. During his Dermatology training he spent a year in the UK focusing on the multi-disciplinary management of skin cancer and connective tissue disorders. Other hospital attachments included Westmead Adults Hospital, Westmead Children’s Hospital, The Skin Hospital Westmead and Royal Prince Alfred Hospital where completed Dermatology training in 2016.

Dr Moreno Bonilla holds Conjoint Lecturer positions at the Medical Schools of University of New South Wales & University of Sydney and is committed to the education of junior doctors and Dermatology research. His work has been presented at local and international meetings, and has also been published in peer reviewed medical journals for the past 12 years.

Dr. Nicholas Stewart

BSc (Biomed), MBBS (UQLD), FACD

Dermatologist + Mohs Micrographic Surgeon

Dr Nicholas Stewart graduated with a Bachelor of Science (Biomedicine) in 2000 and a Bachelor of Medicine and Bachelor of Surgery in 2004, both from the University of Queensland, Brisbane. He completed two years of residency before gaining admission to the Anatomical Pathology Training pathway. He completed the Basic Pathology Examination in 2007, then underwent further basic training in surgery (General Surgery/Plastic Surgery).

Dr Stewart began clinical Dermatology training in 2011 at the Royal Prince Alfred Hospital. Subsequent posts included Concord Hospital, Westmead Adults and Westmead Children’s Hospitals. He received fellowship with the Australasian College of Dermatologists in 2014 and the following year was selected to undertake a Mohs Surgery Fellowship.

Dr Stewart is a dermatologist with special interest in cutaneous surgery. He is a qualified Mohs Surgeon at the Skin Hospital at Westmead and Darlinghurst, Sydney. He also practices general medical dermatology and paediatric dermatology at both locations.

Dr. Michael Liu


Dermatology Registrar

Dr Michael Liu is an advanced trainee in dermatology. As a medical student he won a Medical Defence Union Bursary award, allowing him to travel to Hong Kong to further his surgical skills. He has a clinical background in intensive care, including a full year of intensive care and retrieval medicine at John Hunter Hospital, as well as general medicine, and as a medical registrar he won the prestigious award of Registrar of the Year at both Wollongong Hospital and Prince of Wales Hospital.

Whilst gaining experience in dermatology he worked under the tutelage of both Professor Ross Barnetson and Professor Wolfgang Weninger in the Biologics Clinic for severe psoriasis patients at Royal Prince Alfred Hospital, gaining valuable experience in the use of biologics. This was further augmented with a clinical placement at Liverpool Hospital Dermatology Department which includes a large Biologics Clinic.

Our Support Staff

Professional, patient-oriented and friendly people.

At Green Square Dermatology we believe that through our specialised and dedicated clinical staff, we can achieve the best outcomes for our patients. We are committed to attracting and working with talented medical specialists and clinical staff to help us meet our vision … to make our patients our priority.

K.e.n.n.e.t.h   H.a.r.v.e.y

Business Manager

With over 20 years experience in finance and enterprise IT systems, Kenneth brings a fresh perspective to medical practice management. Hands-on experience in almost every aspect of daily operation allows him to be responsive and empathetic to a patient expectations.

Kenneth has a special interest in efficient and eco-friendly business processes, from custom-built low-power servers to paperless business workflows.

Melanie Macnab

Clinical Nurse

Melanie is a caring, empathetic and knowledgeable nurse who provides personalised care for each of her patients.

Starting her career as an Australian Army trained medic, Melanie brings over 25 years of nursing experience, ranging from surgical wards to emergency care, to our medical practice. Her studies in anthropology allow her to understand patient needs and apply care cognisant of different cultural views.

Responsible for managing and supporting day-to-day medical services and treatments directed by the dermatologists, Melanie delivers her care with a smile and professional manner.

Maggie Tseung

Clinical Nurse

An enthusiastic, compassionate and friendly nursing professional, Maggie is a Registered Nurse with experience in the private and public healthcare systems.

Responsible for managing and supporting day-to-day medical services, Maggie is invaluable in assisting our Dermatologists with surgical procedures, patient education and after-care.

Maggie has a special interest in cosmetic laser procedures and is currently completing her training under Dr Rhonda Harvey.

Michelle Weaich

Clinical Nurse

An energetic, friendly and professional individual, Michelle works closely with our clinic and other specialist dermatology centres.

Michelle works closely with our core Clinical Nurses and Dermatologists to provide our patients with quality dermatological health care.

Rebecca Wolf

Medical Receptionist

Bright, cheerful and organised, Bekkie is responsible for providing a continuity of service between our patients and our dermatologists.

Bekkie comes from a local court and emergency services background, bringing unique people and administrative skills to our environment. As part of her commitment to further development,
Bekkie is currently completing her NSW paramedic training.

Ashleigh Cullen

Medical Receptionist

As an energetic and empathic team member, Ashleigh takes great personal satisfaction in helping patients connect with our Dermatologists.

With her debut into a medical specialist environment, Ashleigh comes well trained with customer service experience spanning both the finance and hospitality industries.

Madeleine Tsetong

Medical Receptionist

Quick with a smile and ready to help our patients, Maddy brings a focused and youthful energy to our team.

When Maddy isn’t working with our team she is completing a Commerce at university and working in fashion retail.

Blake Harvey

Office Intern

As one of the youngest members of the Green Square Dermatology team, Blake has been involved in our family run clinic since he was 2 years old.

Blake assists with the day-to-day running of the clinic, accumulating valuable inter-personal, communication and business skills … but only after he’s finished his homework.